Anodically Deposited Mn-Mo-Fe Oxide Anodes for Oxygen Evolution in Hot Seawater Electrolysis

Ghany, Nabil A. Abdel; Meguro, Shinsaku; Kumagai, Naokazu; Asami, K.; Hashimoto, Kôji

doi:10.2320/matertrans.44.2114

Cited by 21 publications

(12 citation statements)

References 26 publications

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“…Wider cracks and larger areas surrounded by the cracks in both the 1# and the 2# units ( Fig. S7A and B) were observed at pH 1.5, in comparison to the results at pH 2.0 and 4.0, consistent with the morphology of Mn, Mo and W co-deposits in conventional electrochemical processes [33]. Larger W and Mo grain sizes were consistently observed in the 1# (Fig.…”

Section: Effect Of Initial Phsupporting

confidence: 80%

“…Thus, significant fluctuations in the concentrations of W(VI) and Mo(VI) in the wastewater generally occurs [3,[5][6], which translates in variable rates of W and Mo deposition, and thus variable rates of hydrogen production in the MEC units of the stacked BESs. Similarly, pH plays a significant role on the nature of the W and Mo ionic forms present in aqueous solution, on the degree of polymerization of W in electrochemical processes [33], and on the rate of hydrogen evolution in MECs [34][35]. Furthermore, the cathode material also plays an important role.…”

Section: Introductionmentioning

confidence: 99%

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Deposition and separation of W and Mo from aqueous solutions with simultaneous hydrogen production in stacked bioelectrochemical systems (BESs): Impact of heavy metals W(VI)/Mo(VI) molar ratio, initial pH and electrode material

Huang

Pan

et al. 2018

Journal of Hazardous Materials

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The deposition and separation of W and Mo from aqueous solutions with simultaneous hydrogen production was investigated in stacked bioelectrochemical systems (BESs) composed of microbial electrolysis cell (1#) serially connected with parallel connected microbial fuel cell (2#). The impact of W/Mo molar ratio (in the range 0.01 mM : 1 mM and vice-versa), initial pH (1.5 to 4.0) and cathode material (stainless steel mesh (SSM), carbon rod (CR) and titanium sheet (TS)) on the BES performance was systematically investigated. The concentration of Mo(VI) was more influential than W(VI) in determining the rate of deposition of both metals and the rate of hydrogen production. Complete metal recovery was achieved at equimolar W/Mo ratio of 0.05 mM : 0.05 mM. The rates of metal deposition and hydrogen production increased at acidic pH, with the fastest rates at pH 1.5. The morphology of the metal deposits and the valence of the Mo were correlated with W/Mo ratio and pH. CR cathodes (2#) coupled with SSM cathodes (1#) achieved a significant rate of hydrogen production (0.82 ± 0.04 m/m/d) with W and Mo deposition (0.049 ± 0.003 mmol/L/h and 0.140 ± 0.004 mmol/L/h (1#); 0.025 ± 0.001 mmol/L/h and 0.090 ± 0.006 mmol/L/h (2#)).

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Section: Effect Of Initial Phsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Deposition and separation of W and Mo from aqueous solutions with simultaneous hydrogen production in stacked bioelectrochemical systems (BESs): Impact of heavy metals W(VI)/Mo(VI) molar ratio, initial pH and electrode material

Huang

Pan

et al. 2018

Journal of Hazardous Materials

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“…16,17) The etched substrate was coated with IrO 2 as the intermediate layer using precursor of 0.1 kmol m À3 chloroiridic acid in butanol solution. This layer is necessary to avoid the formation of insulating titanium oxide between electrocatalytically active manganese oxides and Ti substrate during seawater electrolysis at high current densities for a long time.…”

Section: Electrodesmentioning

confidence: 99%

Nanocrystalline Manganese-Molybdenum-Tungsten Oxide Anodes for Oxygen Evolution in Acidic Seawater Electrolysis

et al. 2005

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In an attempt to tailor new oxygen evolution anodes for acidic seawater electrolysis, manganese-molybdenum-tungsten oxide anodes were prepared by anodic deposition on IrO 2 /Ti substrate using 0. O 2þxþy electrodes were promising oxygen evolving anodes for acidic seawater electrolysis. It has been concluded that additions of both tungsten and molybdenum beneficially bring about an increase in the real electro-catalytic activity along with the formation of deposits with optimum thickness and good adherence to the IrO 2 /Ti substrate.

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“…The oxygen evolution efficiency was estimated by the difference between the total charge passed during electrolysis and the charge consumed for formation of chlorine analyzed by iodometric titration. The detailed method and accuracy of iodometric titration have been written elsewhere [12].…”

Section: Electrode Performancementioning

confidence: 99%

“…The addition of Mo 6+ [4,6] and/or W 6+ [7] was effective, showing the 100 % oxygen evolution efficiency. Formation of triple oxides, such as Mn-Mo-W oxides [8][9][10], Mn-Mo-Fe oxides [11,12] and Mn-Mo-Sn oxides [13,14] were particularly effective for extension of the lifetime of the anode. The electrocatalysts with Mo, W, Fe and/or Sn were all identified as a single phase multiple oxides of γ-MnO 2 structure, without forming any second oxide phase, and were stable without suffering from oxidative dissolution in the form of MnO 4 in spite of the polarization potential far higher than the oxidation potential of MnO 2 to MnO 4…”

Section: Introductionmentioning

confidence: 99%

Novel Anode Materials for Oxygen Evolution during Seawater Electrolysis for Green Hydrogen Fuel Production

El‐Moneim¹

2011

IJTEE

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Mn 1-x-y Mo x W y O 2+x+y triple oxide electrocatalysts for the anode producing oxygen without forming chlorine in seawater electrolysis were prepared by anodic deposition. The performance of the anode for oxygen evolution in 0.5 M NaCl solutions was examined. The tungsten addition was effective in extending the life of the anode by decreasing the density of pores in electrocatalysts responsible for partial detachment of electrocatalysts, which occurs by high pressure of oxygen formed preferentially at the bottom of pores during electrolysis. Repeated anodic deposition of the electrocatalyst significantly extended the life of the anode, because repeated deposition was able to cover the pores in the underlying electrocatalysts. The potential observed in anodic polarization of an oxide electrode was the sum of the overpotential of the electrochemical reaction and the potential drop as a result of passage of current through the oxide. The potential difference of the two anodes at individual current, E i , versus the current, i, should show the straight line: The gradient, E i /i, is the difference of the electrical resistances of the two electrodes, and the activity of the two anodes can be compared from the current, i, at E i = 0 volt. The tungsten addition enhanced the activity for oxygen evolution.

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Anodically Deposited Mn-Mo-Fe Oxide Anodes for Oxygen Evolution in Hot Seawater Electrolysis

Cited by 21 publications

References 26 publications

Deposition and separation of W and Mo from aqueous solutions with simultaneous hydrogen production in stacked bioelectrochemical systems (BESs): Impact of heavy metals W(VI)/Mo(VI) molar ratio, initial pH and electrode material

Deposition and separation of W and Mo from aqueous solutions with simultaneous hydrogen production in stacked bioelectrochemical systems (BESs): Impact of heavy metals W(VI)/Mo(VI) molar ratio, initial pH and electrode material

Nanocrystalline Manganese-Molybdenum-Tungsten Oxide Anodes for Oxygen Evolution in Acidic Seawater Electrolysis

Novel Anode Materials for Oxygen Evolution during Seawater Electrolysis for Green Hydrogen Fuel Production

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